Questions tagged [matlab]
MATLAB is a commercial numerical computer algebra system
573
questions
0
votes
1
answer
44
views
Confusion regarding simulation in Simulink?
Please check the attached snap especially the portion in red marked area, which is simulation stop time and it has default value of 10? Is it 10 second or any other unit? According to my experience, ...
- 1,171
1
vote
0
answers
34
views
How to determine beamforming pattern?
I have a beamforming vector, which includes amplitude and phase information. How can I determine the corresponding beamforming pattern for the antenna and plot it in Matlab? For example, I have a ...
- 11
2
votes
0
answers
40
views
Type 3 compensator with opamp compare calculation/simu and measured difference
I'm designing a type 3 compensator with an opamp for a flyback which is operating in a constant voltage mode.
Therefore I measured the plant and started to design a suitable type 3 compensator to ...
- 31
0
votes
2
answers
45
views
Why does MATLAB show a pole in bode plot of an underdamped second order system at natural frequency?
I am using the sisotool in MATLAB to obtain the bode plot of the following transfer function:
MATLAB marks a pole at wo which is approximately 11.18
What is the meaning of this? How would you even ...
0
votes
1
answer
31
views
Quick PMSM FOC PI controler design
For a Simulink Model I am looking for a quick and easy way to estimate PI-controller parameters for a speed control loop and Id and Iq controler of a PMSM using FOC.
I don't have a real motor just the ...
- 75
0
votes
0
answers
52
views
Stuck during designing a PI Controller
I'm trying to design a PI Controller on the basis of this paper: "Design of robust PI control systems based on sensitivity analysis and genetic algorithms." by Jau-Woei Perng • Shan-Chang ...
- 1
3
votes
0
answers
38
views
What kind of model can be used to simulate over- and under voltage in a Li-Battery pack?
So far I have not much experience with modeling in the field of lithium-ion cells or batteries except equivalent circuit models (ecm)-models which I've implemented and used for simulations in Matlab/...
- 185
0
votes
0
answers
22
views
Plotting the radiation pattern of a half-wave dipole antenna with a frequency of 144 MHz in MATLAB
I need to plot the radiation pattern of a half-wave dipole antenna with a frequency of 144 Mhz in MATLAB but I don't know the code, can someone please help me?
- 1
0
votes
0
answers
29
views
How to simulate equivalent circuit of a transformer referred to primary side in Matlab?
I was given an assignment to demonstrate a three-phase transformer simulation using Matlab Simulink. I have to demonstrate the simulations of simplified per phase equivalent circuit of a three-phase ...
- 11
1
vote
0
answers
87
views
What is the Z transform of the discrete PI control model？
I have a discreate PI controller implemented in stm32 MCU, it has the following form:
$$
PI=K_p\cdot[r(t_i)-y(t_i)] + (K_I)\cdot\sum_{n=0}^{i}[r(t_n)-y(t_n)]\cdot\Delta t
$$
where
\$r(t_i)\$ is the ...
- 11
2
votes
1
answer
59
views
Rotated gyroscope 180 degrees but integration shows 90
I'm a student new to sensors. I'm currently calibrating the gyroscope from the following IMU: ICM42670. I was able to get the bias by leaving the gyro for some time and getting the average of the ...
- 29
0
votes
0
answers
18
views
PWM in ANSYS Twinbuilder software
Where can I learn PWM Control stratergies for MOSFET using algorithms in an inverter, in ANSYS Twinbuilder software? I also want to get familiarised with ANSYS interface.
- 1
0
votes
1
answer
45
views
pulse generator MATLAB
How to create a rectangular waveform with amplitude 18 to -3 using pulse generator? If I put 18 as the amplitude then the wave is between 18 and 0. How do I change that to 18 to -3?
2
votes
0
answers
46
views
How to have sharper rise for ideal filter frequency response in matlab
I am writing about analog filters in my blog and I decided to plot the frequency responses using matlab, representing the responses using step functions. But matlab uses heaviside function which does ...
- 21
0
votes
1
answer
86
views
Solving for Normalised Frequency with LLC Gain Equation
I would like help solving the equation below for Fn within matlab or Octave (preferably).
What I know is the following:
MG = 1.3
QE = 0.52
LN = 3.5
Because I am following this reference(https://www....
- 118
0
votes
0
answers
50
views
SVPWM Dwell time calculation and switching vector
I have modeled a SVPWM for a two-level, three-phase inverter. The modulation index for svpwm is selected as MI = 3Vref/2Vdc, the dwell time is selected based on sector and alpha (angle in each sector),...
- 1
0
votes
0
answers
40
views
How to obtain a bode plot for this circuit in Matlab online version
So I've an electrical circuit in matlab as follows:
I've already setup the points of linear analysis. But I can't the option for linear analysis in the linearization tab.
The problem is that I cannot ...
- 33
0
votes
1
answer
44
views
Phase Coefficient versus frequency plot
I have been asked to confirm that the propagation characteristics of a transmission line, with the given parameters
R= 2.2 Ohm, L = 105nH, C = 69pF, G = 14 nS.
Along with these two equations,
I have ...
- 1
0
votes
0
answers
52
views
Three-Phase Thyristor Bridge Converter Simulation on Matlab
I am looking for a 24 pulse rectifier to power an electrolyser using a universal thyristor bridge from matlab. I am using a phase shifting zig zag transformer for this. The transformers are shifted by ...
- 1
0
votes
1
answer
59
views
Simulink question: How was this response obtained if the input is zero?
If the input is zero here, how was the response on the right obtained? Also, how was gain block changed to equal to τ?
Please note this is a first order system with the equation dx/dt = 1/τ(u-x)
- 33
0
votes
0
answers
66
views
How to do Phase Resolved Partial Discharge (PRPD) analysis using MATLAB and Simulink?
I've been asked to simulate a model in Simulink for Phase Resolved Partial Discharge (PRPD) Analysis for an input signal and store the output data from the model in a file (in txt/csv/excel format), ...
1
vote
2
answers
174
views
Trouble calculating transfer function of 3rd order RC lowpass filter
I am working on simulations of a 3rd order RC filter.
Cascaded first order RC lowpass X3 with:
R = 100 ohms,
C = 3.3 nF.
When I perform the calculations for the transfer function I get a result that ...
- 11
0
votes
0
answers
40
views
Implementing a digital controller in the time domain
I have simulated a digital control system in the Z domain using MATLAB and I have got satisfactory results. However, when I converted the plant and the digital controller to difference equations and ...
- 986
0
votes
1
answer
18
views
Scaling load profiles for simulation
I am trying to simulate the behaviour of my power converter when it is subjected to different load conditions (in this case a refrigerator load).
I have the load profile of a refrigerator load that ...
2
votes
2
answers
71
views
python vs matlab? [closed]
What is so special about MATLAB? Why in engineering (especially electrical engineering) hasn't pyhton replaced it?
I was watching a Youtube video regarding MATLAB:
https://www.youtube.com/watch?v=...
- 21
0
votes
1
answer
61
views
Phase response in MATLAB simulation doesn't match the book
I am trying to replicate a result from a textbook that I am using to study input filter design for buck converters.
The parameters for the converter and filter are as follows:
D = 0.5
L = 100 μH
C = ...
- 83
0
votes
0
answers
14
views
Why is the extract() function returning the same data for different inputs in MATLAB?
For some very strange reason, the extract() function appears to be returning the original s-parameter data for the first object again and again!
It should return different data depending on the new ...
- 43
1
vote
0
answers
45
views
Analog Circuit Modelling in Simscape (Simulink) doesn't work (No Input sighted)
I tried rebuilding the analog circuit for the Lorenz Attractor in Simulink using Simscape toolbox. Luckily they have also an analog multiplier circuit built-in and I re-wired everything just as the ...
- 11
0
votes
0
answers
46
views
How to model a balun connected to an antenna object in MATLAB?
My goal is create an RF network in MATLAB using the antenna and RF toolboxes where I already have a 4:1 balun that has been fully characterized as a Touchstone file (s2p). I also have designed a loop ...
- 43
1
vote
1
answer
51
views
Unable to determine transfer function to obtain root locus
This one is pretty straightforward. We set K1 = 4 and want to bring out K2 as a common factor so we can plot the root locus for the system. The correct answer is:
$$\small G_{new}(s)=4K_2\frac{(s+6)}{(...
- 45
0
votes
1
answer
90
views
How do PSIM z-blocks and s-blocks + ZOH work? MATLAB and PSIM results not matching
I've just came across PSIM's digital control and C blocks. My main goal is, in the future, to implement a dynamic control with C block in PSIM.
I created the circuit below and it runs:
The circuit ...
0
votes
0
answers
55
views
Analog filter gain in simulation is not as expected
I want to have a 1 stage analog active filter with a cutoff frequency of 26 kHz. I used the MATLAB analog filter design toolbox to create such a filter. The filter that was provided by MATLAB looks ...
- 123
0
votes
1
answer
95
views
Buck converter confusing output voltage waveform
I've constructed a simple DC-DC buck converter circuit in Simulink with ideal components.
I'm getting a weird output voltage waveform. Although the average output voltage matches my calculations, the ...
- 23
0
votes
0
answers
43
views
Simulating the step response of a closed-loop system with disturbance
How do I simulate in MatLab the step response of a closed-loop system with disturbance (see image below)? I can't seem to derive a straightforward transfer function output/input due to the disturbance....
0
votes
1
answer
90
views
What is the correct way to measure DC power at the input of a multilevel inverter in a Simulink simulation?
I modelled a 11 level cascaded multilevel inverter, and I would like to measure the power at the input of the inverter, so I do not know how to properly evaluate the actual input power of that ...
- 1
0
votes
0
answers
60
views
Why is the voltage rising when I expect a voltage drop in my model?
matlab model
In the model, I have four blocks each with three homes. I am feeding the homes with a three phase voltage source. On the way to homes there are resistors and inductors so I expect ...
0
votes
0
answers
77
views
How do I model switches in Matlab/Simulink?
I am trying to model different types of switches in Matlab/Simulink. There is this type of switch that I can't find a name for or design. I am not an expert in digital logic, I only have the basics ...
- 101
0
votes
1
answer
101
views
How is the transfer function block in simulink labelled as linear ? especially for the cases where variable 's' has power greater than 1
https://www.mathworks.com/help/simulink/slref/transferfcn.html
Above weblink gives description about the transfer function block in simulink. I am confused why it is written in the description at top ...
- 1,171
0
votes
0
answers
40
views
What does the Torque sign mean in FEMM?
I am working on a project on analysis of Synchronous Machine using FEMM and MATLAB. I am running a code to rotate the motor and record the values of the torque. I am exciting the stator with 3-phase ...
- 57
0
votes
0
answers
32
views
Is there any way to find the area between to graphs in Simulink?
I have two graphs, where I want to find the area between them in Simulink. However, I can't seem to find out how to do it.
Is there any way to do this in the scope, or how can this be achieved?
It is ...
1
vote
2
answers
94
views
Matlab calculation with laplace analysis is different from what I got in LTspice
Here is the circuit diagram.
Waveform for the current passing through voltage source.
The code I use for Matlab .
...
- 319
0
votes
1
answer
67
views
RFID Antenna Simulation using MATLAB
I have designed a PCB with RFID antenna and I want to simulate this antenna. I know I need to use PCB Antenna Design APP in MATLAB for this. My MATLAB version is 2017b, this version only has Antenna ...
- 643
0
votes
0
answers
151
views
Is there a way to only perform a block action at a given time interval in simulink?
I want to use my moving average block but ONLY for 30 seconds from the time from 10 sec to 40 sec in my 50 sec simulink simulation.
How can I do this? I don't want it to act from 0-10 seconds and from ...
0
votes
0
answers
91
views
Antenna synthesis using Fourier Transform method
My attempt at formulating an answer for part i:
Questions: Am I going in the right direction?
The result of the integrals is not a sin(x)/x function like I was expecting and I don't know how to plot ...
0
votes
2
answers
168
views
How to design filters with transfer function?
I want to design filters base on transfer function and Bode plots. For example, lets say I want a low pass filter, the limit is 36hz. How should I design a transfer function base on 36 hz limit? (pls ...
- 123
1
vote
1
answer
100
views
Generating sawtooth waveform
I am trying to generate a sawtooth waveform between 0 and 1 which would have a frequency upto 200 kHz. I run this piece of code within a Matlab function block - it works fine up to 10 kHz, but higher ...
- 366
0
votes
2
answers
39
views
Double pole, double zero: incorrect plot?
I can't seem to find where I'm going wrong here. Suppose I want a double pole, double zero system that looks like this:
$$ \dfrac{\left(1+\dfrac{s}{\omega_z}\right)\left(1+\dfrac{s}{\omega_z}\right)}{\...
- 366
0
votes
0
answers
214
views
Battery nominal capacity estimation using Coulomb Counting and Matlab lsqnonlin
I'm trying to estimate the nominal capacity of a PV plant battery pack collecting SOC data from the BMS using current discharge. Once I've collected current, time and SOC data I put those data into ...
1
vote
0
answers
61
views
Calculating the current through a time-varying RLC series resonant circuit
As shown in the circuit below, an admittance \$Y\$ consists of a series resonant circuit \$Y_m\$ and an additional capacitance \$C_0\$ in parallel.
\$Y\$ is given by
\$Y = j \omega C_0 + Y_m = j \...
- 659
0
votes
0
answers
71
views
Finding thermal resistance and capacitance from thermal impedance curve
I'm trying to calculate thermal resistance and capacitance from the thermal impedance curve with data taken from the thermal impedance graph using non-linear curve fitting method on MATLAB.
The ...
- 1